Bill answered most of the question, but having worked internationally, and quite literally, on beaches, for migratory shore birds and sea turtle nesting sites, they can be rehabilitated. It depends on the nature of the interaction and what's going on around them.
Your question was whether can this be turned around. Yes, it can. Boston, for example, put in legislation banning motor vehicles on beaches during the plover nesting season. Many of the resorts around the Caribbean shut their lights off at night. When a sea turtle hatches, there's a fine band of light between the ocean and the sky, and that baby sea turtle heads for that in the water. If there's a light behind it, it goes that way.
It can be done. It depends on the impact initially and how degraded the beach is. If it's not degraded, it's about how it can be rehabilitated and how the folks who are using the beach will cooperate in the rehabilitation effort.